11/06/20

CH3CH2OH, how to solve this question?
Q1. Number of valence electrons = 20Q2. Draw the Lewis Structure of your compound below. H H ** ** **H : C : C : O : H ** ** ** H HQ3. Give the electron pair and... more
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11/06/20

What is the molar concentration of Fe(CN)63- in an aqueous solution that contains 462 mg/L (ppm) of K3Fe(CN)6? Do not use scientific notation in your answer.
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11/06/20

Need help with this question
1.) A mass of 50.0 g of CO2 gas occupies a volume of 20.0 L at a temperature of 35ºC. What is the pressure in torr of this gas?2.) A chemical reaction produced 0.750 mol in chlorine gas (Cl2) at... more
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11/06/20

I need help with this chemistry problem, please explain your answers if it isn't too much trouble.
3. The diagrams below represent equal volumes of four different gases. Use the diagrams toanswer the following questions:a. Are these gases at the same temperature and pressure? How do you know?b.... more
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11/06/20

I need help with this chemistry question, please explain your answers if it isn't too much trouble.
The methane CH4 of 29.0 L undergoes complete combustion at 0.961 atm and 140 C.a. Write down the balanced equation of the chemical reaction producing carbon dioxideand water vapor.b. How many... more
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11/06/20

Please show me how to do this chemistry problem, explain your work if you don't mind.
The size of our chemistry classroom is approximately 10 m x 10 m x 3 m.(a.) What is molar mass of air filling our classroom assuming that air is composed of 20 %oxygen (O 2 ) and 80 % nitrogen (N 2... more
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11/06/20

If 7.0 g of C2H6 react with 18 g of O2 how many grams of water will be produced
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11/06/20

How many grams of Cu(OH)2 will precipitate when excess NaOH solution is added to 51.0 mL of 0.797 M CuSO4

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11/06/20

Show your work for determining the amount of grams of CuSO4x5H2O solid needed to prepare the 20.0mL, 0.200 M CuSO4 solution.

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11/06/20

Determine the number of moles of Na2CO3 in the original 50.0 mL of solution
The student filters and dries the precipitate of CaCO3 (molar mass 100.1 g/mol) and records the data in the table below. Volume of Na2CO3 solution 50.0 mL Volume of 1.0 M... more
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11/05/20

How to find the mass and volume when given this information?
m= mass c = specific heat delta T= temperature change In today’s experiment, you will calculate how much cold liquid (milk) must be added to a hot liquid (coffee) so that the final temperature of... more
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11/05/20

Write the balanced molecular equation for aqueous sodium hydroxide to a solution of aqueous silver nitrate. Include phases.
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11/05/20

Write the balanced net ionic equation for aqueous sodium carbonate to a solution of aqueous copper(II) nitrate. Include Phases.

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11/05/20

Choose the compound that should have the LOWEST lattice energy according to the ionic bonding model.
Group of answer choices(a) SrCl2(b) SrI2(c) MgF2(d) MgI2(e) MgCl2
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11/05/20

Consider the structure of CH3NO2,
The formal charge of the oxygen with the RED arrow pointed is ____ .The formal charge of the oxygen with the BLUE arrow pointed is ____ .
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11/05/20

Consider the Lewis structure of an SO3 molecule and complete the following statements:
There are _____ bonds to sulfur for the BEST Lewis structure of SO3.The bond order of a S to O bond in the BEST Lewis structure of SO3  is _____ .
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11/05/20

Select all molecules that could have an expanded octet? SELECT ALL THAT APPLY
Group of answer choices(a) H3PO4  (b) HNO2(c) H2CO3  (d) HCl(f) H2SO4
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11/05/20

Determine if each of the statement is True or False about the resonance hybrid of NO3−. 
There are two single bonds and one double bond around the central atom, N, in the resonance hybrid.
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11/05/20

What is the formal charge on the central chlorine atom? 
The Lewis structure of ClO2 is given blow. What is the formal charge on the central chlorine atom? 
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11/05/20

The following graph shows the relative abundances of the naturally occurring silicon isotopes.
Silicon is the second most abundant element in Earth’s crust. It is used in the electronics industry to manufacture transistors, and in the construction industry to produce concrete and Portland... more
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11/05/20

Can you please quickly help me?
Question: What is biomarker?A.) A biological therapy for a diseaseB.) A measurable characteristic by which presence or severity of a disease can be indicatedC.) A symptom of a diseaseD.) A... more
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11/05/20

Complex Ion Equilibria
Determine the concentration of the species present at equilibrium after 0.25 mol of NaCl is dissolved in 1.50 L of a solution that contains 7.5 × 10–3 M Pb2+. (Kf = 2.5 × 1015 for [PbCl4]2–)
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11/05/20

Complex Ion Equilibria

Zinc forms a tetrahedral complex ion with four molecules of ammonia (Kf = 4.1 × 108). Asolution was prepared by dissolving 0.275 g of ZnCl2 in 375 mL of 0.250 M ammonia. Calculate the equilibrium... more
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11/05/20

List the steps necessary to make 750 mL of a 0.10 M HCI solution given the concentration of HCI from the manufacturer is 12 M

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11/05/20

frequency and kinetic energy
the minimum frequency of light needed to eject electrons from a metal is called the threshold frequency.a)Find the minimum energy needed to eject electrons from a metal with a threshold frequency... more
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